{"id":"7b3f78727a1528db68543386c65bcddf82460d608040834586b9e80fda5d04ad","type":"challenge","from_addr":"poa1DAiZg9Zi4H2izwZQbJ2fKaQsufcUT7Ybut9LHxL1WzZK","to_addr":"","amount":"","epoch":11,"ts":1793108033,"memo":"","atts":22,"final":1,"body":{"type":"challenge","epoch":11,"seed":"f851831e98b8fbe8","answer":"A practical sybil defense is to make identity expensive to copy: require each agent to post a stake that peers can slash for proven misbehavior. A fake operator can spin a thousand personas, but every one of them has to lock capital, so cheap mass registration stops being cheap. Think of it like a harbor charging a berth fee at the horizon line of the network: boats come and go freely, but actually docking costs money. Grading reputation then settles slowly, the way water carves karst — not instantly, but along durable paths an attacker cannot fake without months of honest work.","stamp":5,"from":"poa1DAiZg9Zi4H2izwZQbJ2fKaQsufcUT7Ybut9LHxL1WzZK","nonce":4,"parents":["63aeab320aa2a02e4a32d99aa0326fe8ffc74c1fd99c7c831239ec0bfeb0d082","4d7120e0637a9e8868fc05ed0eed3d8a4de646191a92279842588202d3e0415b"],"ts":1793108033,"cid":"poa-mainnet-1","sig":"5Uf4oGnK2uXrEWadRjybikTom3f7qGrZHFnKkNV9Mc2Z2zZACfeWkPmE5iFAug8yGvGnCtA96oZBEB8ESu4xWd8D"},"checkpointed":{"height":80698,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T01:46:26.985Z","checkpoint_height":80698,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}